I love my gf but she is the true definition of a narcissist. It's breaking me

Tl;dr My girlfriend's great ... she's a good mom .. She's nice. She's friendly. She's caring to people. It's probably the best sexual connection I've ever had with somebody ever. And she's extremely attractive. . I do think that she loves me. I an 44 raised two kids in college. She's 37 with an eight year-old single mom. I do think that she cares about me.

But it is completely obvious that her and her son come first before anything. And on top of that, we literally fight every week. And it's never just a small one. And it's literally always almost always the same thing. And it's because she never wants to fix the problem. She can never accept accountability. We've been together for a year and a half and I think I've gotten a total of maybe four apologies out of her and it was a battle every time . I'm deathly far from perfect. But I can always admit my wrongs and apologize and learn from it and try to fix it. I don't get any of that from her. And then on top of that, she will literally tell me that I'm doing things that she's doing. And there's just no talking to her. It's like talking to a crazy person honestly when we get into an argument. Like she will literally not make sense and I will specifically speak in details in facts. Prove that nothing she's saying is right. But yet there is no proving. Even if you put it right in front of her face and say look, this is exactly what's happening and it's proven and obvious. She will literally disregard that. Half the time she twist what happens and makes up her own thing that happened and that drives me mentally insane. Because I'm standing there I was there the whole time. And if you tell her no and prove it, she will still stick to her story. And still continuously put me down tell me I'm wrong and tell me that it's always me. Everything is always me no matter what even if I'm not fighting and I'm just trying to talk to her about something it turns into me being wrong. I know what they say when dealing with a narcissist the only thing you could do is run away.. I'm getting to that point but at the same time I don't want to because we have a great connection and I saw a Future... isn't there friggin anything you can do about this?